Grade A ebay trolling - eviltoast

I heard today a hilarious story about a person trolling an ebay seller. The item was listed with a £10 target price, which the person thought was not going to be offered, so made an offer of £5. The seller replied with £7.50. Okey then, my offer is now £4.50. The item did not sell. The following week the item was listed again. The person offered £3.50. The item did jot sell. The following week the item was listed again. The person offered £2.50. The item did jot sell. At £1.50 the seller was becoming rather upset about this approach. What was the reply, you might ask. “See you next week.”